It sounds like the speed control plate is not correctly adjusted. If you take the back cover off of the mixer (it is held in place with a screw at the top) and try adjusting the screws on the back plate you may be able to get the mixer to slow down.
You will notice two screws at the top of the speed control plate:
If you turn the top screws one quarter turn, both equally then test the mixer it should adjust the speed. Please make sure not to over tighten or loosen these screws as it can damage the speed control plate! You should not have to mess with any wires attached to the speed control plate or the bottom screw.
If you need more information please see the service manual here:
http://ep.yimg.com/ty/cdn/mendingshed/kitchenaidservicemanual.pdf
It will specifically go over how to trouble shoot the mixer and how to adjust the speed control plate.
Please let me know if you have any questions
-Colleen @Mending Shed
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